We need to change the flow from
* parse all the strings
* set capabilities defaults
* build installer
* fill in all guest defaults
To
* parse boot and metadata strings
* set capabilities defaults
* build installer
* set --name default
* parse all the remaining strings
* fill in all guest defaults
Because --disk parsing depends on --name for some path generation.
So this fixes --disk names when --name is implicitly specified by
--install or --osinfo
Signed-off-by: Cole Robinson <crobinso@redhat.com>